The excerpt that best uses sensory details to show readers that the dogs are close to death is:
"All the stiffness and gloss had gone out of his beautiful furry coat. The hair hung down, limp and draggled, or matted with dried blood where Hal’s club had bruised him. The pain of the beating was dull and distant, just as the things their eyes saw and their ears heard seemed dull and distant. . . . They were simply so many bags of bones in which sparks of life fluttered faintly."
This passage effectively employs sensory imagery—describing the limp, draggled fur, the matted blood, and the dullness of pain and perception—to convey the physical and emotional state of the dogs, highlighting their suffering and the closeness of death.